第二章：微服务架构构建-优快云博客

本文链接：https://blog.youkuaiyun.com/wcy_0522/article/details/127182856

第二章：微服务架构构建

2.1：IDEA新建project工作空间

父工程步骤
1. New Project
2. 聚合总父工程名字
3. Maven版本选择
4. 字符编码
5. 注解生效激活
6. Java编译版本选择8

父工程pom文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.wang.cloud</groupId>
    <artifactId>cloud2022</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>pom</packaging>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <junit.version>4.12</junit.version>
        <log4j.version>1.2.17</log4j.version>
        <lombok.version>1.16.18</lombok.version>
        <mysql.version>8.0.19</mysql.version>
        <druid.version>1.1.16</druid.version>
        <spring.boot.version>2.2.2.RELEASE</spring.boot.version>
        <spring.cloud.version>Hoxton.SR1</spring.cloud.version>
        <spring.cloud.alibaba.version>2.1.0.RELEASE</spring.cloud.alibaba.version>
        <mybatis.spring.boot.version>1.3.0</mybatis.spring.boot.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <!--springboot 2.2.2-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring.boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--Spring cloud Hoxton.SR1-->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring.cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--Spring cloud alibaba 2.1.0.RELEASE-->
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>${spring.cloud.alibaba.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>${mysql.version}</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>${druid.version}</version>
            </dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <fork>true</fork>
                    <addResources>true</addResources>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

Maven中的dependencyManagement
1. Maven使用dependencyManagement元素来提供了一种管理依赖版本号的方式。通常会在一个组织或者项目的最顶层的父pom中看到dependencyManagement元素。
2. 使用pom.xml中的dependencyManagement元素能让所有在子项目中引用一个依赖而不显示的列出版本号。Maven会沿着父子层次向上走，直到找到一个拥有dependencyManagement元素的项目，然后它就会使用这个dependencyManagement元素中指定的版本号。
3. 这样做的好处就是：如果多个子项目都引用同一样的依赖，则可以避免在使用的子项目里都声明一个版本号，这样想升级或切换到另一个版本时，只需要在顶层父容器里更新，而不需要一个一个子项目的修改，另外如果某个子项目需要另外的一个版本，只需声明version版本。
4. dependencyManagement里只是声明依赖，并不实现引入，因此子项目需要显示的声明需要用依赖。

2.2：Rest微服务工程搭建

cloud-provider-payment8001微服务提供者Module模块

建module
- 右键New Module，然后直接下一步
- 模块命名

改POM

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>
        <!--mysql-connector-java-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!--jdbc-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
</dependencies>

写YML

server:
  port: 8001

spring:
  application:
    name: cloud-payment-service
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource            # 当前数据源操作类型
    driver-class-name: org.gjt.mm.mysql.Driver              # mysql驱动包 com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/db2019
    username: root
    password: root

mybatis:
  mapperLocations: classpath:mapper/*.xml
  type-aliases-package: com.wang.cloud.entities    # 所有Entity别名类所在包

主启动

package com.wang.cloud;

@SpringBootApplication
public class PaymentMain8001 {
    public static void main(String[] args) {
        SpringApplication.run(PaymentMain8001.class, args);
    }
}

业务类

创建数据库和表

CREATE DATABASE db2022;

 CREATE TABLE `payment` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'ID',
  `serial` varchar(200) DEFAULT '',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8

entities

主实体

package com.wang.cloud.entities;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class payment implements Serializable {
    private Long id;
    private String serial;
}

Json封装体CommonResult

package com.wang.cloud.entities;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult<T> {

    private Integer code;
    private String message;
    private T data;

    public CommonResult(Integer code, String message) {
        this(code, message, null);
    }

}

dao

接口PaymentDao

package com.wang.cloud.dao;

@Mapper
public interface PaymentDao {

    public int create(Payment payment);

    public Payment getPaymentById(@Param("id") Long id);

}

mybatis的映射文件PaymentMapper.xml文件

路径：src\main\resources\mapper\PaymentMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >

<mapper namespace="com.wang.cloud.dao.PaymentDao">

    <insert id="create" parameterType="Payment" useGeneratedKeys="true">
        INSERT INTO payment(SERIAL) VALUES(#{serial});
    </insert>

    <resultMap id="BaseResultMap" type="com.wang.cloud.entities.Payment">
        <id column="id" property="id" jdbcType="BIGINT" />
        <result column="serial" property="serial" jdbcType="VARCHAR" />
    </resultMap>
    <select id="getPaymentById" parameterType="Long" resultMap="BaseResultMap">
        SELECT * FROM payment WHERE id=#{id};
    </select>

</mapper>

service

接口PaymentService

package com.wang.cloud.service;

public interface PaymentService {

    public int create(Payment payment);
    public Payment getPaymentById(@Param("id") Long id);

}

实现类

package com.wang.cloud.service.impl;

@Service
public class PaymentServiceImpl implements PaymentService {

    @Resource
    private PaymentDao paymentDao;

    @Override
    public int create(Payment payment) {
        return paymentDao.create(payment);
    }

    @Override
    public Payment getPaymentById(Long id) {
        return paymentDao.getPaymentById(id);
    }
    
}

controller

package com.wang.cloud.controller;

@RestController
@Slf4j
public class PaymentController {

    @Resource
    private PaymentService paymentService;

    @PostMapping(value = "/payment/create")
    public CommonResult create(Payment payment) {
        int result = paymentService.create(payment);
        log.info("*****插入操作返回结果:" + result);

        if (result > 0) {
            return new CommonResult(200, "插入数据成功", result);
        } else {
            return new CommonResult(200, "插入数据失败", null);
        }
    }

    @GetMapping(value = "/payment/get/{id}")
    public CommonResult<Payment> getPaymentById(@PathVariable("id") Long id) {    
        Payment payment = paymentService.getPaymentById(id);
        log.info("****查询结果:{}", payment);
        if (payment != null) {
            return new CommonResult(200, "查询成功", payment);
        } else {
            return new CommonResult(444, "没有对应记录，查询ID" + id, null);
        }
    }

}

热部署Devtools

Adding devtools to your project

注：放在8001项目里，如果上方已经引入，此处可以不引入
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-devtools</artifactId>
    <scope>runtime</scope>
    <optional>true</optional>
</dependency>

Adding plugin to your pom.xml

注：放在父项目里，如果上方已经引入，此处可以不引入
<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <configuration>
                <fork>true</fork>
                <addResources>true</addResources>
            </configuration>
        </plugin>
    </plugins>
</build>

Enabling automatic build
update the value of
重启IDEA

cloud-consumer-order80微服务消费者订单Module模块

建cloud-consumer-order80模块

改pom

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

写yml
```
server:
  port: 80
```

主启动

package com.wang.cloud;

@SpringBootApplication
public class MainApp80 {

    public static void main(String[] args) {
        SpringApplication.run(MainApp80.class, args);
    }
}

业务类

entities

主实体Payment

package com.wang.cloud.entities;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Payment implements Serializable {

    private Long id;
    private String serial;
}

Json封装体CommonResult

package com.wang.cloud.entities;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult<T> {

    private Integer code;
    private String message;
    private T data;

    public CommonResult(Integer code, String message) {
        this(code, message, null);
    }
}

config配置类

package com.wang.cloud.config;

@Configuration
public class ApplicationContextConfig {

    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }
}

controller

package com.wang.cloud.controller;

@RestController
public class OrderController {

    public static final String PaymentSrv_URL = "http://localhost:8001";

    @Autowired
    private RestTemplate restTemplate;

    @GetMapping("/consumer/payment/create")
    public CommonResult create(Payment payment) {
        return restTemplate.postForObject(PaymentSrv_URL + "/payment/create", payment, CommonResult.class);
    }

    @GetMapping("/consumer/payment/get/{id}")
    public CommonResult getPayment(@PathVariable Long id) {
        return restTemplate.getForObject(PaymentSrv_URL + "/payment/get/" + id, CommonResult.class, id);
    }
}

工程重构

由于子模块中有重复的entities部分，所以要进行工程重构

新建cloud-api-commons

改pom

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.1.0</version>
        </dependency>
</dependencies>

entities

主实体Payment

package com.wang.cloud.entities;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Payment implements Serializable {

    private Long id;
    private String serial;
}

Json封装体CommonResult

package com.wang.cloud.entities;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult<T> {

    private Integer code;
    private String message;
    private T data;

    public CommonResult(Integer code, String message) {
        this(code, message, null);
    }
}

maven命令clean、install

订单80和支付8001分别改造

删除各自原先有过的entities文件夹

修改各自模块的pom添加如下内容

<dependency>
    <groupId>com.wang.cloud</groupId>
    <artifactId>cloud-api-commons</artifactId>
    <version>1.0-SNAPSHOT</version>
</dependency>